Electrode material, membrane electrode assembly, CO2 electrolysis device, and method for producing CO2 electrolysis product

Abstract

An electrode material containing a carrying body and an anion exchange resin. The carrying body includes a conductive carrier and a catalyst, the catalyst is supported on the conductive carrier, and the catalyst includes one or a plurality of particles selected from a metal complex, a metal, and an inorganic compound. The anion exchange resin covers a part or all of a surface of the carrying body, the anion exchange resin includes an ionomer containing one or a plurality of groups selected from a primary amino group, a secondary amino group, a tertiary amino group, and a quaternary ammonium group, and a basic site density of the ionomer is 2.0 mmol/cm 3 or more and 5.0 mmol/cm 3 or less.

The invention claimed is: 
     
       1. An electrode material, comprising:
 a plurality of carrying bodies formed such that each of the carrying bodies comprises a conductive carrier and a plurality of catalyst particles supported by the conductive carrier; and 
 an anion exchange resin comprising an ionomer and formed on the plurality of carrying bodies such that 70% or more of a surface of each of the carrying bodies is covered by a layer of the anion exchange resin and that the ionomer comprises at least one group selected from the group consisting of a primary amino group, a secondary amino group, a tertiary amino group, and a quaternary ammonium group, 
 wherein the plurality of catalyst particles includes at least one of a metal complex, a metal, and an inorganic compound, and the ionomer of the ion exchange resin has a basic site density in a range of 2.0 mmol/cm 3  to 5.0 mmol/cm 3 . 
 
     
     
       2. The electrode material according to  claim 1 , wherein the basic site density of the ionomer is 2.5 mmol/cm 3  or more and less than 4.5 mmol/cm 3 . 
     
     
       3. The electrode material according to  claim 1 , wherein the plurality of carrying bodies formed such that the conductive carrier in each of the carrying bodies has a particulate form. 
     
     
       4. The electrode material according to  claim 3 , wherein the plurality of carrying bodies formed such that the conductive carrier in each of the carrying bodies has an average particle diameter in a range of 10 nm to 1000 μm. 
     
     
       5. The electrode material according to  claim 1 , wherein the plurality of carrying bodies formed such that the conductive carrier in each of the carrying bodies has a staple fiber form. 
     
     
       6. The electrode material according to  claim 5 , wherein the plurality of carrying bodies formed such that the conductive carrier in each of the carrying bodies has an average fiber length in a range of 10 nm to 1000 μm. 
     
     
       7. The electrode material according to  claim 5 , wherein the plurality of carrying bodies formed such that the plurality of catalyst particles in each of the carrying bodies has an average particle diameter in a range of 0.001 μm to 100 μm. 
     
     
       8. The electrode material according to  claim 1 , wherein the basic site density of the ionomer is 2.9 mmol/cm 3  or more and less than 4.5 mmol/cm 3 . 
     
     
       9. The electrode material according to  claim 1 , wherein the plurality of carrying bodies formed such that an amount of the catalyst particles in each of the carrying bodies is in a range of 10% by mass to 70% by mass with respect to 100% by mass of a total amount of a respective one of the carrying bodies. 
     
     
       10. The electrode material according to  claim 1 , wherein the plurality of carrying bodies formed such that an amount of the catalyst particles in each of the carrying bodies is in a range of 20% by mass to 60% by mass with respect to 100% by mass of a total amount of a respective one of the carrying bodies. 
     
     
       11. The electrode material according to  claim 1 , wherein the plurality of carrying bodies formed such that an amount of the catalyst particles in each of the carrying bodies is in a range of 30% by mass to 50% by mass with respect to 100% by mass of a total amount of a respective one of the carrying bodies. 
     
     
       12. The electrode material according to  claim 1 , wherein the plurality of carrying bodies formed such that the conductive carrier in each of the carrying bodies comprises at least one of a carbon material, titanium, tantalum, gold, silver and copper. 
     
     
       13. The electrode material according to  claim 1 , wherein the anion exchange resin is formed such that the layer of the anion exchange resin on each of the carrying bodies has an average covering thickness in a range of 0.01 μm to 100 μm. 
     
     
       14. A membrane-electrode assembly, comprising:
 the electrode material of  claim 1 ; 
 an ion exchange membrane; and 
 a current collector positioned such that the electrode material is formed between the ion exchange membrane and the current collector. 
 
     
     
       15. The membrane-electrode assembly according to  claim 14 , wherein the ion exchange membrane is an anion exchange membrane. 
     
     
       16. The membrane-electrode assembly according to  claim 15 , wherein a material of the ion exchange membrane is the same as the anion exchange resin of the electrode material. 
     
     
       17. A CO 2  electrolytic device, comprising:
 the electrode material of  claim 1 . 
 
     
     
       18. A method for producing a CO 2  electrolysis product, comprising:
 supplying CO 2  to the CO 2  electrolytic device according to of  claim 17 ; and 
 electrolyzing the CO 2  within the CO 2  electrolytic device such that the electrolysis product is obtained, 
 wherein the CO 2  electrolytic device includes a cathode comprising the electrode material. 
 
     
     
       19. A CO 2  electrolytic device, comprising:
 the membrane-electrode assembly of  claim 14 . 
 
     
     
       20. A method for producing a CO 2  electrolysis product, comprising:
 supplying CO 2  to the CO 2  electrolytic device of  claim 19 ; and 
 electrolyzing the CO 2  within the CO 2  electrolytic device such that the electrolysis product is obtained, 
 wherein the membrane electrode assembly is a cathode of the CO 2  electrolytic device.